Android 二维码扫描怎样实现第二次（重复）扫描

Android 二维码扫描怎样实现第二次（重复）扫描

首先看一下扫描界面

CaptureCodeActivity.java代码：

package com.haier.qr.code;import java.io.IOException;import java.io.Serializable;import java.util.Map;import java.util.Vector;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.DialogInterface.OnCancelListener;import android.content.DialogInterface.OnClickListener;import android.content.Intent;import android.graphics.Bitmap;import android.os.Bundle;import android.os.Handler;import android.text.TextUtils;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.widget.Toast;import com.google.zxing.BarcodeFormat;import com.google.zxing.DecodeHintType;import com.google.zxing.Result;import com.haier.cabinet.customer.R;import com.haier.cabinet.customer.activity.DeliveryBoxListActivity;import com.haier.common.util.AppToast;import com.haier.qr.code.zxing.camera.CameraManager;import com.haier.qr.code.zxing.decoding.CaptureActivityHandler;import com.haier.qr.code.zxing.decoding.FinishListener;import com.haier.qr.code.zxing.decoding.InactivityTimer;import com.haier.qr.code.zxing.view.ViewfinderView;/** * Initial the camera * * @author jdsjlzx */public class CaptureCodeActivity extends Activity implements Callback,View.OnClickListener { private static final String TAG = CaptureCodeActivity.class .getSimpleName(); private CameraManager cameraManager; private CaptureActivityHandler handler; private ViewfinderView viewfinderView; private boolean hasSurface; private Map decodeHints; private Vector decodeFormats; private String characterSet; private InactivityTimer inactivityTimer; private boolean isFlashlightOpen; /** * 声音震动管理器。如果扫描成功后可以播放一段音频，也可以震动提醒，可以通过配置来决定扫描成功后的行为。 */ private BeepManager beepManager; /** * 闪光灯调节器。自动检测环境光线强弱并决定是否开启闪光灯 */ private AmbientLightManager ambientLightManager; public CameraManager getCameraManager() { return cameraManager; } /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Window window = getWindow(); window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); setContentView(R.layout.activity_capture); hasSurface = false; inactivityTimer = new InactivityTimer(this); beepManager = new BeepManager(this); ambientLightManager = new AmbientLightManager(this); //按钮监听事件 findViewById(R.id.capture_flashlight).setOnClickListener(this); } @Override protected void onResume() { super.onResume(); Log.d(TAG, "onResume"); cameraManager = new CameraManager(getApplication()); viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view); viewfinderView.setCameraManager(cameraManager); viewfinderView.setVisibility(View.VISIBLE); SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view); SurfaceHolder surfaceHolder = surfaceView.getHolder(); if (hasSurface) { initCamera(surfaceHolder); } else { // 防止sdk8的设备初始化预览异常 surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // Install the callback and wait for surfaceCreated() to init the // camera. surfaceHolder.addCallback(this); } decodeFormats = null; characterSet = null; // 加载声音配置，其实在BeemManager的构造器中也会调用该方法，即在onCreate的时候会调用一次 beepManager.updatePrefs(); // 启动闪光灯调节器 ambientLightManager.start(cameraManager); // 恢复活动监控器 inactivityTimer.onResume(); } @Override protected void onPause() { Log.d(TAG, "onPause"); if (handler != null) { handler.quitSynchronously(); handler = null; } inactivityTimer.onPause(); ambientLightManager.stop(); beepManager.close(); // 关闭摄像头 cameraManager.closeDriver(); if (!hasSurface) { SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view); SurfaceHolder surfaceHolder = surfaceView.getHolder(); surfaceHolder.removeCallback(this); } super.onPause(); } @Override protected void onDestroy() { inactivityTimer.shutdown(); super.onDestroy(); } /** * A valid barcode has been found, so give an indication of success and show * the results. * * @param rawResult * The contents of the barcode. * @param scaleFactor * amount by which thumbnail was scaled * @param barcode * A greyscale bitmap of the camera data which was decoded. */ public void handleDecode(Result rawResult, Bitmap barcode, float scaleFactor) { Log.d(TAG, "handleDecode"); inactivityTimer.onActivity(); beepManager.playBeepSoundAndVibrate(); String resultString = rawResult.getText(); if (TextUtils.isEmpty(resultString)) { Toast.makeText(CaptureCodeActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show(); } else { //扫码完成，处理结果（跳转到箱子列表） /*Intent resultIntent = new Intent(); Bundle bundle = new Bundle(); bundle.putString("result", resultString); bundle.putParcelable("bitmap", barcode); resultIntent.putExtras(bundle); this.setResult(RESULT_OK, resultIntent);*/ String terminalNo = getIntent().getStringExtra("terminal_no"); if (resultString.equals(terminalNo)) { AppToast.makeToast(this, "确认成功！"); Intent intent = new Intent(this, DeliveryBoxListActivity.class); intent.putExtra("terminal_no", terminalNo); intent.putExtra("box_list", (Serializable) getIntent().getSerializableExtra("box_list")); startActivity(intent); CaptureCodeActivity.this.finish(); } else { /*AppToast.makeToast(this, "确认失败，请重新扫描确认");*/ showErrorDialog(); } } } private void initCamera(SurfaceHolder surfaceHolder) { if (surfaceHolder == null) { throw new IllegalStateException("No SurfaceHolder provided"); } if (cameraManager.isOpen()) { Log.w(TAG, "initCamera() while already open -- late SurfaceView callback?"); return; } try { cameraManager.openDriver(surfaceHolder); // Creating the handler starts the preview, which can also throw a // RuntimeException. if (handler == null) { handler = new CaptureActivityHandler(this, decodeFormats, decodeHints, characterSet, cameraManager); } } catch (IOException ioe) { Log.w(TAG, ioe); displayFrameworkBugMessageAndExit(); } catch (RuntimeException e) { // Barcode Scanner has seen crashes in the wild of this variety: // java.?lang.?RuntimeException: Fail to connect to camera service Log.w(TAG, "Unexpected error initializing camera", e); displayFrameworkBugMessageAndExit(); } } private void displayFrameworkBugMessageAndExit() { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle(getString(R.string.app_name)); builder.setMessage(getString(R.string.msg_camera_framework_bug)); builder.setPositiveButton(android.R.string.yes, new FinishListener(this)); builder.setOnCancelListener(new FinishListener(this)); builder.show(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceCreated(SurfaceHolder holder) { if (holder == null) { Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!"); } if (!hasSurface) { hasSurface = true; initCamera(holder); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { hasSurface = false; } public ViewfinderView getViewfinderView() { return viewfinderView; } public Handler getHandler() { return handler; } public void drawViewfinder() { viewfinderView.drawViewfinder(); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.capture_flashlight: if (isFlashlightOpen) { cameraManager.setTorch(false); // 关闭闪光灯 isFlashlightOpen = false; } else { cameraManager.setTorch(true); // 打开闪光灯 isFlashlightOpen = true; } break; default: break; } } private void showErrorDialog() { closeCamera(); viewfinderView.setVisibility(View.GONE); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle(getString(R.string.app_name)); builder.setMessage("扫描确认出错，请重新扫描二维码！"); builder.setPositiveButton(android.R.string.ok, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { restartCamera(); } }); builder.setOnCancelListener(new OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { CaptureCodeActivity.this.finish(); } }); builder.show(); } void restartCamera(){ Log.d(TAG, "hasSurface " + hasSurface); viewfinderView.setVisibility(View.VISIBLE); SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view); SurfaceHolder surfaceHolder = surfaceView.getHolder(); initCamera(surfaceHolder); // 恢复活动监控器 inactivityTimer.onResume(); } void closeCamera(){ if (handler != null) { handler.quitSynchronously(); handler = null; } inactivityTimer.onPause(); // 关闭摄像头 cameraManager.closeDriver(); }}

private void showErrorDialog() { closeCamera(); viewfinderView.setVisibility(View.GONE); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle(getString(R.string.app_name)); builder.setMessage("扫描确认出错，请重新扫描柜子上的二维码！"); builder.setPositiveButton(android.R.string.ok, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { restartCamera(); } }); builder.setOnCancelListener(new OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { CaptureCodeActivity.this.finish(); } }); builder.show(); }

closeCamera（相当于onPause）和restartCamera（onResume）方法就不贴代码了。

先把代码贴出来：

ViewfinderView.java

/* * Copyright (C) 2008 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.haier.qr.code.zxing.view;import java.util.Collection;import java.util.HashSet;import android.content.Context;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;import com.google.zxing.ResultPoint;import com.haier.cabinet.postman.R;import com.haier.qr.code.zxing.camera.CameraManager;/** * This view is overlaid on top of the camera preview. It adds the viewfinder * rectangle and partial transparency outside it, as well as the laser scanner * animation and result points. * */public final class ViewfinderView extends View { private static final String TAG = "ViewfinderView"; /** * 刷新界面的时间 */ private static final long ANIMATION_DELAY = 10L; private static final int OPAQUE = 0xFF; /** * 四个绿色边角对应的长度 */ private int ScreenRate; /** * 四个绿色边角对应的宽度 */ private static final int CORNER_WIDTH = 10; /** * 扫描框中的中间线的宽度 */ private static final int MIDDLE_LINE_WIDTH = 6; /** * 扫描框中的中间线的与扫描框左右的间隙 */ private static final int MIDDLE_LINE_PADDING = 5; /** * 中间那条线每次刷新移动的距离 */ private static final int SPEEN_DISTANCE = 5; /** * 手机的屏幕密度 */ private static float density; /** * 字体大小 */ private static final int TEXT_SIZE = 16; /** * 字体距离扫描框下面的距离 */ private static final int TEXT_PADDING_TOP = 30; /** * 画笔对象的引用 */ private Paint paint; /** * 中间滑动线的最顶端位置 */ private int slideTop; /** * 中间滑动线的最底端位置 */ private int slideBottom; /** * 将扫描的二维码拍下来，这里没有这个功能，暂时不考虑 */ private Bitmap resultBitmap; private final int maskColor; private final int resultColor; private final int resultPointColor; private Collection possibleResultPoints; private Collection lastPossibleResultPoints; boolean isFirst; private CameraManager cameraManager; public ViewfinderView(Context context, AttributeSet attrs) { super(context, attrs); density = context.getResources().getDisplayMetrics().density; //将像素转换成dp ScreenRate = (int)(20 * density); paint = new Paint(); Resources resources = getResources(); maskColor = resources.getColor(R.color.viewfinder_mask); resultColor = resources.getColor(R.color.result_view); resultPointColor = resources.getColor(R.color.possible_result_points); possibleResultPoints = new HashSet(5); } public void setCameraManager(CameraManager cameraManager) { this.cameraManager = cameraManager; } @Override public void onDraw(Canvas canvas) { if (cameraManager == null) { return; // not ready yet, early draw before done configuring } //中间的扫描框，你要修改扫描框的大小，去CameraManager里面修改 Rect frame = cameraManager.getFramingRect(); if (frame == null) { return; } //初始化中间线滑动的最上边和最下边 if(!isFirst){ isFirst = true; slideTop = frame.top; slideBottom = frame.bottom; } //获取屏幕的宽和高 int width = canvas.getWidth(); int height = canvas.getHeight(); paint.setColor(resultBitmap != null ? resultColor : maskColor); //画出扫描框外面的阴影部分，共四个部分，扫描框的上面到屏幕上面，扫描框的下面到屏幕下面 //扫描框的左边面到屏幕左边，扫描框的右边到屏幕右边 canvas.drawRect(0, 0, width, frame.top, paint); canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint); canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint); canvas.drawRect(0, frame.bottom + 1, width, height, paint); if (resultBitmap != null) { // Draw the opaque result bitmap over the scanning rectangle paint.setAlpha(OPAQUE); canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint); } else { //画扫描框边上的角，总共8个部分 paint.setColor(Color.GREEN); canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate, frame.top + CORNER_WIDTH, paint); canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top + ScreenRate, paint); canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right, frame.top + CORNER_WIDTH, paint); canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top + ScreenRate, paint); canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left + ScreenRate, frame.bottom, paint); canvas.drawRect(frame.left, frame.bottom - ScreenRate, frame.left + CORNER_WIDTH, frame.bottom, paint); canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH, frame.right, frame.bottom, paint); canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate, frame.right, frame.bottom, paint); //绘制中间的线,每次刷新界面，中间的线往下移动SPEEN_DISTANCE slideTop += SPEEN_DISTANCE; if(slideTop >= frame.bottom){ slideTop = frame.top; } canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint); //画扫描框下面的字 /*paint.setColor(Color.WHITE); paint.setTextSize(TEXT_SIZE * density); paint.setAlpha(0x40); paint.setTypeface(Typeface.create("System", Typeface.BOLD)); canvas.drawText(getResources().getString(R.string.scan_text), frame.left, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint);*/ Collection currentPossible = possibleResultPoints; Collection currentLast = lastPossibleResultPoints; if (currentPossible.isEmpty()) { lastPossibleResultPoints = null; } else { possibleResultPoints = new HashSet(5); lastPossibleResultPoints = currentPossible; paint.setAlpha(OPAQUE); paint.setColor(resultPointColor); for (ResultPoint point : currentPossible) { canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 6.0f, paint); } } if (currentLast != null) { paint.setAlpha(OPAQUE / 2); paint.setColor(resultPointColor); for (ResultPoint point : currentLast) { canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 3.0f, paint); } } //只刷新扫描框的内容，其他地方不刷新 postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom); } } public void drawViewfinder() { resultBitmap = null; invalidate(); } /** * Draw a bitmap with the result points highlighted instead of the live * scanning display. * * @param barcode * An image of the decoded barcode. */ public void drawResultBitmap(Bitmap barcode) { resultBitmap = barcode; invalidate(); } public void addPossibleResultPoint(ResultPoint point) { possibleResultPoints.add(point); }}

有网友反馈代码不全，

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